1. Eyes absent, antenna 1 as long as body length............................ Quasimelita abyssorum (Stephensen, 1944)
- Eyes present, antenna 1 shorter than body length............................................................ 2
2. Pleon segments with dorsal carination.................................................................... 3
- Pleon segments without dorsal carination.................................................................. 5
3. Pleon segments 1–3 with one large central tooth and two small lateral teeth each............. Quasimelita tolyza sp. nov.
- Only pleon segments 2–3 with one central tooh each......................................................... 4
4. Anterior head lobe large, rounded, coxa 1 not serrated, with rounded anterior corner, basis of pereopod 7 linear.................................................................................. Quasimelita formosa (Murdoch, 1885)
- Anterior head lobe truncated (Fig. 16 c), coxa 1 serrated, with pointed anterior corner, basis of pereopod 7 expanded, with rounded posterior wing.................................................. Quasimelita serraticoxae sp. nov. (part)
5. Anterior head lobe large, rounded, coxa 1 not serrated, with rounded anterior corner................................ 6
- Anterior head lobe truncated (Fig. 16 c), coxa 1 serrated, with pointed anterior corner...................................................................................................... Quasimelita serraticoxae sp. nov. (part)
6. Outer ramous of uropod 3 is short, slightly longer than peduncle length......... Quasimelita quadrispinosa (Vosseler, 1889)
- Outer ramous of uropod 3 is long, 2.9–3.3 times as long as peduncle....................... Quasimelita jarettii sp. nov.